nrf52840 zephyr disable uart0 warning

RE: nrf52840 zephyr disable uart0 warning

Sigurd Hellesvik — Fri, 14 Apr 2023 13:38:12 GMT

Here is a sample following your hello world explanation below, where I disable the console.

Do you see the error for this?

devzone.nordicsemi.com/.../console_5F00_disabled.zip

Regards,
Sigurd Hellesvik

RE: nrf52840 zephyr disable uart0 warning

boris bergman1 — Fri, 14 Apr 2023 13:28:42 GMT

No, that is not the solution:

CMake Warning at /home/bergm006/ncs/v2.3.0/zephyr/CMakeLists.txt:824 (message):
  No SOURCES given to Zephyr library: drivers__console

  Excluding target from build.

RE: nrf52840 zephyr disable uart0 warning

Sigurd Hellesvik — Tue, 11 Apr 2023 07:18:09 GMT

CONFIG_CONSOLE is enabled by default, and it selects UART_CONSOLE, which depends on CONFIG_SERIAL.

So to get rid of the warning, set:

CONFIG_UART_CONSOLE=n

CONFIG_CONSOLE=n

By the way, if you are doing power optimization, maybe this page can be helpful later.

Regards,
Sigurd Hellesvik

RE: nrf52840 zephyr disable uart0 warning

boris bergman1 — Thu, 06 Apr 2023 16:01:51 GMT

To make things simpler the hello world project has the same issue.

#include <zephyr/kernel.h>

void main(void)
{
	while(1) {
		k_sleep(K_MSEC(1000));
	}
}

&uart0 {
    status = "disabled";
};

proj.conf empty (and when I add CONFIG_SERIAL=n the same warning appears)

RE: nrf52840 zephyr disable uart0 warning

boris bergman1 — Wed, 05 Apr 2023 09:47:00 GMT

CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
CONFIG_HEAP_MEM_POOL_SIZE=2048


CONFIG_BT=y

CONFIG_BT_SMP=y
CONFIG_BT_SIGNING=y
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_DIS=y
CONFIG_BT_ATT_PREPARE_COUNT=5
CONFIG_BT_PRIVACY=y
CONFIG_BT_DEVICE_NAME="xxx"
CONFIG_BT_DEVICE_APPEARANCE=3137
CONFIG_BT_DEVICE_NAME_DYNAMIC=y
CONFIG_BT_DEVICE_NAME_MAX=65


CONFIG_BT_KEYS_OVERWRITE_OLDEST=y
CONFIG_BT_SETTINGS=y
CONFIG_FLASH=y
CONFIG_FLASH_PAGE_LAYOUT=y
CONFIG_FLASH_MAP=y
CONFIG_NVS=y
CONFIG_SETTINGS=y
CONFIG_I2C=y
CONFIG_EVENTS=y
CONFIG_SERIAL=n
CONFIG_LOG=n
CONFIG_PM=y
CONFIG_PM_DEVICE=y

(The error only occures when CONFIG_SERIAL=y, when '=n, the warning of the first post appears.)

RE: nrf52840 zephyr disable uart0 warning

Sigurd Hellesvik — Wed, 05 Apr 2023 05:55:55 GMT

Hi,

Can you post your prj.conf as well?

Regards,
Sigurd Hellesvik

RE: nrf52840 zephyr disable uart0 warning

boris bergman1 — Tue, 04 Apr 2023 15:42:20 GMT

Nope, disabling like that in the devicetree does not work,

/home/bergm006/ncs/v2.3.0/zephyr/include/zephyr/device.h:83:41: error: '__device_dts_ord_114' undeclared here (not in a function); did you mean '__device_dts_ord_11'?
   83 | #define DEVICE_NAME_GET(dev_id) _CONCAT(__device_, dev_id)

I did not include device.h in my project.

#include <stdio.h>
#include <zephyr/kernel.h>
#include <zephyr/types.h>
#include <zephyr/pm/pm.h>
#include <zephyr/pm/device.h>
#include <stddef.h>
#include <string.h>
#include <errno.h>
#include <zephyr/sys/byteorder.h>
#include <zephyr/kernel.h>
#include <zephyr/logging/log.h>
#include <zephyr/settings/settings.h>
#include <zephyr/bluetooth/bluetooth.h>
#include <zephyr/bluetooth/hci.h>
#include <zephyr/bluetooth/conn.h>
#include <zephyr/bluetooth/uuid.h>
#include <zephyr/bluetooth/gatt.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/logging/log.h>
#include <zephyr/drivers/i2c.h>

RE: nrf52840 zephyr disable uart0 warning

Sigurd Hellesvik — Tue, 04 Apr 2023 07:29:34 GMT

[quote user=""]CONFIG_SERIAL=n in prj.conf. But I get the following warning:[/quote]

Use the "Kconfig" search in VS Code to determine what sets this to "y".
Just looks like you set UART_CONSOLE in you project config somewhere, and it is automatically set to "n" when you disable SERIAL, which makes sense to me.

[quote user=""]I also tried to just disable serial in the device tree[/quote]

You try to disable uart0 inside pinctrl, and not inside the driver itself. Try:

&uart0 {
    status = "disabled";
};

Then after you build, have a look at build/zephyr/zephyr.dts to verify that all the drivers have the expected status.

[quote user=""]Edit: I guess it should be[/quote]

Both DeviceTree and Power Management are good ways to disable a peripheral to save power.

Use the DeviceTree if you never intend to use that peripheral.
Use the Power Management if you intend to use the peripheral sporadically.

Regards,
Sigurd Hellesvik